package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充
 */
@Aspect
@Slf4j
@Component
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 前置通知,公共字段赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinpoint){
        log.info("公共字段自动填充...");
        //获得数据库操作类型
        MethodSignature signature = (MethodSignature)joinpoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型

        //获得拦截到的方法的对象
        Object[] args = joinpoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];
        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //赋值
        if(operationType == OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setCreateUser.invoke(entity,currentId);
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);


            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            }
        } else if(operationType == OperationType.UPDATE){
             try {
                 Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                 Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                 setUpdateTime.invoke(entity,now);
                 setUpdateUser.invoke(entity,currentId);


            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                 throw new RuntimeException(e);
             } catch (IllegalAccessException e) {
                 throw new RuntimeException(e);
             }
        }

    }
}
